Simple way to match value from list to cell content

Hello good people of Excel Forum!

I've read many many threads by now and just don't seem to get an answer to my issue so here goes nothing:

I have a list of 36 domain names that I'd like to match with a list of >600 sub domain names.
So in Column A I have the list of domains and Column B the list of sub domains.
Every cell in Column B contains a value from Column A and I'd like to have that value returned in Column C.

For example
MatchExample.JPG

Thanks a thousand in advance, there are probably several examples that I missed but I just could get any of them to work.